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Definition of Polyphenol

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polyhydroxy phenol (Chemistry)
Polyphenol Definition from Medicine Dictionaries & Glossaries
NCI Dictionary of Cancer Terms
A substance that is found in many plants and gives some flowers, fruits, and vegetables their color. Polyphenols have antioxidant activity.
A Service of the National Cancer Institute.
Polyphenol Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
Polyphenols (noun, pronunciation of the singular or , also known as polyhydroxyphenols) are a structural class of mainly natural, but also synthetic or semisynthetic, organic chemicals characterized by the presence of large multiples of phenol structural units. The number and characteristics of these phenol structures underlie the unique physical, chemical, and biological (metabolic, toxic, therapeutic, etc.) properties of particular members of the class. Examples include tannic acid (image at right), and ellagitannin (image below). The historically important chemical class of tannins is a subset of the polyphenols.

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